# EG1397

**EG Micro** · AC-DC Controllers And Regulators · SOP-16

EG1397 from EG Micro, in a SOP-16. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | CSS | output | Soft-start capacitor pin, which is reset to reset the soft-start before start-up or under overload. |
| 2 | Fmax | input | An external resistor on this pin sets the maximum operating frequency (Fmax). |
| 3 | Ctimer | bidirectional | Sets the fault delay time; the timer capacitor is charged to 4 V to turn off the pulse output and recovers to 1 V to restart. |
| 4 | Rt | input | An external resistor on this pin sets the minimum operating frequency, corresponding to VFB = 1 V; Rt reference voltage is 2.18 to 2.42 V. |
| 5 | BO | input | Detects low input voltage and turns off the outputs when the voltage is above 4 V (BO undervoltage reference 1.1 V typ., lock voltage 4 V typ.). |
| 6 | FB | input | Current flowing into this pin increases the oscillator frequency up to Fmax; the FB voltage range is 1.1 V to 5.3 V, with frequency rising as FB rises. |
| 7 | DT | input | An external resistor on this pin sets the dead time, adjustable from 100 ns to 2 µs. |
| 8 | Skip/Disable | input | When VFB < 0.3 V, releasing this pin enters soft-start mode; when FB is above 0.3 V, soft-start is not entered and burst-mode control applies (skip comparator threshold 690 mV typ.). |
| 9 | Fault | input | Current-sense input: on overcurrent the fault delay timer counts and the soft-start capacitor discharges while frequency rises to limit power; above the higher threshold (Vref(OCP) 1.55 V typ.) the timer charging current is increased 8 times. |
| 10 | GND | power_in | Ground pin of the chip. |
| 11 | LO | output | Low-side gate drive output with 0.8 A source and 1.3 A sink peak current capability. |
| 12 | VCC | power_in | Chip operating supply input; VCC absolute maximum rating is 20 V (VCC turn-on 10.5 V typ., turn-off 9 V typ.). |
| 13 | NC | unconnected | No connection; leave floating. |
| 14 | VS | power_in | High-side driver floating ground (VS absolute range VB-25 V to VB+0.3 V). |
| 15 | HO | output | High-side gate drive output with 0.8 A source and 1.3 A sink peak current capability. |
| 16 | VB | power_in | High-side floating supply input; VB absolute maximum rating is 650 V (VB-to-VS UVLO turn-on 8.5 V typ., turn-off 8 V typ.). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | EG Micro |
| Package | SOP-16 |
| Category | Power Management (PMIC) |
| Pins | 16 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| VB 自举高端电源 (absolute max) | VB | -0.3 |  | 650 | V |  | 8 |
| VCC 低端电源 (absolute max) | VCC | -0.3 |  | 20 | V |  | 8 |
| 控制引脚 CSS、Fmax、Rt、BO、FB、DT、Fault、Skip/Disable (absolute max) |  | -0.3 |  | 6 | V |  | 8 |
| 环境温度 TA (absolute max) | TA | -40 |  | 125 | ℃ |  | 8 |
| 储存温度 Tstr (absolute max) | Tstr | -55 |  | 150 | ℃ |  | 8 |
| 焊接温度 TL (absolute max) | TL |  |  | 300 | ℃ | T=10S | 8 |
| VCC 开启电压 | Vcc(on) | 9.7 | 10.5 | 11.3 | V |  | 9 |
| VCC 关断电压 | Vcc(off) | 8.2 | 9 | 9.8 | V |  | 9 |
| VB 开启电压 | VB(on) | 7.5 | 8.5 | 9.5 | V | VB 相对 VS 电压 | 9 |
| VB 关断电压 | VB(off) | 7 | 8 | 9 | V | VB 相对 VS 电压 | 9 |
| 启动电流 | Istart-up |  | 180 | 300 | uA | VCC<VCC(on) | 9 |
| 最小频率 | FSW(MIN) | 58.2 | 60 | 61.8 | kHz | Rt=34KΩ，Vpin6=0.8V,DT=300nS | 9 |
| 最大频率 | FSW(MAX) | 440 | 500 | 560 | kHz | Rt=34KΩ，Rfmax=1.9KΩ Vpin6=0.8V,DT=300nS | 9 |
| 最大占空比 (HO、LO 输出) | Dmax | 48 |  | 50 | % | HO、LO 输出 | 9 |
| Rt 引脚参考电压 | Vref(Rt) | 2.18 | 2.3 | 2.42 | V |  | 9 |
| 定时器电流 1 | Itimer1 | 150 | 175 | 190 | uA | 定时器电容充电电流，Vref(fault)<Vpin9<Vref(ocp) | 9 |
| 定时器电流 2 | Itimer2 | 1.1 | 1.3 | 1.5 | mA | 定时器电容充电电流，Vpin9>Vref(ocp) | 9 |
| 3 脚高电压 | Vtimer(on) | 3.8 | 4 | 4.2 | V | 关闭输出 | 9 |
| 3 脚恢复电压 | Vtimer(off) | 0.95 | 1 | 1.05 | V | 重启输出 | 9 |
| Skip 比较电压 | Vref(skip) | 660 | 690 | 720 | mV |  | 10 |
| Fault 比较电压 | Vref(fault) | 1 | 1.05 | 1.1 | V |  | 10 |
| 过流保护参考电压 | Vref(OCP) | 1.47 | 1.55 | 1.63 | V |  | 10 |
| 保护延时 | Tp |  | 60 | 100 | nS | 故障保护到输出关闭时间 | 10 |
| BO 欠压参考电压 | VBO | 1.05 | 1.1 | 1.15 | V |  | 10 |
| BO 脚电流 | IBO | 25 | 28 | 31 | uA | Vpin5>VBO | 10 |
| BO 锁住电压 | VIatch | 3.7 | 4 | 4.3 | V |  | 10 |
| 温度保护 TSD | TSD | 120 |  |  | ℃ |  | 10 |
| 最低频率精度 (Fsw min accuracy, 文字描述) |  | -3 |  | 3 | % |  | 13 |
| 最高频率精度 (Fsw max accuracy, 文字描述) |  | -12 |  | 12 | % |  | 13 |

## CAD (KiCad official)

- Symbol: `EG1397`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOP-16 (KiCad packages3D, STEP)
- 3D model files: `eg1397-etched.step` / `eg1397-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `eg1397.step` / `eg1397.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [EG Micro datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590927109562970113) (24 pp, sha256 `9e9352d021561097`, retrieved 2026-10-19, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/eg1397-datasheet.pdf)